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CDX woes

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Top 25 Contributor
Texas, United States
3,701 Posts
Gold Member
sonavor posted on Tue, Aug 19 2014 11:38 PM

Back in 2012 on the old workbench forum, I (kind of) got my first CDX working. The unit required the door hinge fix on the eject switch side and I was able to get the CD player working for a short while. Then it started acting up (working intermittently). Resolving that it was an alignment problem with the hinge switches, I put the CDX up and worked on other projects.

Later, I received a second CDX that had good hinges.

I spent the last week trying to get one good functioning CDX out of the two. I actually had the unit playing CDs for one night. The next morning, it wasn't working again.

So far, I have resoldered the griplets on the two main boards of the first CDX.  The second CDX looks to be a later version and has nicer looking griplets. For now I haven't touched those.

The problem I am having right now is the CD motor spins all of the time. When the lid is open, I checked all of the switches and they measure as expected. Yet the motor spins. Two days ago the CDX unit started functioning correctly.  I could turn power on, open the lid, observe the motor wasn't spinning, insert a CD, hit play and the unit would start right up. It sounded really good when it works. The next morning I turned the unit on, inserted another CD and was surprised the the motor was already spinning the platter. So it broke overnight. 

So at various times I have seen both of my CDX main chassis operate correctly while, right now, they both behave the same and will not stop turning.

That makes me suspect the problem is common to both so it would have to be in the common pieces of my latest tests...which are the lid components: eject assembly, lid door motor assembly and control panel assembly. The only thing is - I have seen it work with those same components. Maybe a loose wire somewhere?

As I said earlier, the two switches on the door open motor assembly and the one switch on the door eject assembly appear to be operating correctly. I can measure continuity and open on the switches as the door hinges go through their travel.

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Top 25 Contributor
Texas, United States
3,701 Posts
Gold Member
Verified by sonavor

Okay Jacques and Martin....Apparently, the griplet re-soldering fixed the CDX. I did just the servo board first, it didn't fix the problem.  Next I did the Decoder board. When I reconnected everything, there it was - the motor powers on stopped. The stopped voltage was less that a volt.  I put the cover back on and tried a CD. The CD played.

This is a goofy piece of audio equipment for sure. I wish I had just soldered one griplet then tested before I moved to the next one. It would have been nice to know which part of the circuit was actually causing the problem.

Another strange thing was that I have two CDX units that fail in the same way (motor wouldn't stop spinning), yet the problem must be two separate issues with the main assembly. I thought that was not a likely scenario and the problem must be something common to both. That theory started falling apart when the problem remained regardless of what lid I used.

So I still have the second (CDX 001 in my earlier references) unit that I will put away for now until I get a door motor gear for it. On that unit I had already reworked the griplets but I guess I will have to retry that again. Of course there could be an actual failed component on the unit...but it had worked as recently as last week.

I will see if this working unit (CDX 002) continues to work tomorrow.

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Top 10 Contributor
Copenhagen / Denmark
13,031 Posts
Dillen replied on Fri, Jun 25 2021 10:09 AM


Hello dillen will you make the other gear ? The big white one that s just after the one you are making? I need this one as mine is broken.


That's the first time I hear about this gear breaking, and there are no plans for reproducing it,
but I'm sure I can find a good one in the dungeons.
PM or email me.


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